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AI Model Cost & Context Calculator

Estimate Claude Fable 5 and other Claude API costs for 1M context, output tokens, prompt caching, Batch API discounts, and Fable-to-Opus switching budgets.

Cost scenario
Batch API 50% discount
Estimated cost
Claude Fable 5
$18.28
$6.09 average per request
Fresh input tokens
150K · $10/MTok
$1.50
Cache write tokens
950K · $12.5/MTok
$11.88
Cache hit tokens
1.9M · $1/MTok
$1.90
Output tokens
60K · $50/MTok
$3.00
Long-context budget
100%
1M used out of 1M per request.
Fable to Opus switch check
Selected
Claude Fable 5
$18.28
Comparison
Claude Opus 4.8
$9.14
Cache break-even
5-minute cache pays off after
1 cache read(s)
1-hour cache pays off after
2 cache read(s)
Current cache savings
Caching saves about $14.73 versus $33.00 with no cache for the same requests and Batch setting.
Budget a 1M-context Claude Fable 5 call

Enter a long prompt, expected output, and request count to see whether a million-token context fits your per-run budget.

Compare Fable with Opus before switching

Use the side-by-side model total to estimate the premium or savings when routing the same workload between Fable, Opus, Sonnet, or Haiku.

Check whether prompt caching is worth it

Separate fresh input from shared context and see the cache write, cache hit, and no-cache totals before designing your API flow.

Pricing assumptions in this tool
Rates are per million tokens

The calculator uses USD per MTok for base input, cache writes, cache hits, and output. It does not estimate provider taxes, enterprise discounts, or marketplace-specific pricing.

Batch discount stacks with caching

When Batch API is enabled, the tool applies the 50% discount to input, output, cache write, and cache read line items because Anthropic says Batch and prompt caching discounts can be combined.

Long context is still token billing

Fable 5, Opus 4.8/4.7/4.6, and Sonnet 4.6 presets use a 1M token window at standard rates. A 900K prompt costs much more than a 9K prompt even without a separate long-context surcharge.

Quick preset rates
Claude Fable 5
1M context, premium Fable tier
$10/MTok
Output $50/MTok
Claude Opus 4.8
1M context at standard rates
$5/MTok
Output $25/MTok
Claude Opus 4.7
1M context at standard rates
$5/MTok
Output $25/MTok
Claude Opus 4.6
1M context at standard rates
$5/MTok
Output $25/MTok
AI model cost calculator FAQ

Quick answers for Claude Fable 5 cost, cache break-even, Batch API discounts, and long-context budgeting.

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